fix(operator): Watch for CredentialsRequests on CCOAuthEnv only

[periklis]

What this PR does / why we need it: Registers the controller watcher for CredentialRequest only when CCOAuthEnv: true OpenShift environments. Resolves issue:

{"_ts":"2024-04-24T16:02:28.027229225Z","_level":"0","_component":"loki-operator_controller-runtime_source_EventHandler","_message":"failed to get informer from cache","_error":{"msg":"failed to get API group resources: unable to retrieve the complete list of server APIs: cloudcredential.openshift.io/v1: the server could not find the requested resource"}}

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Checklist

• [x] Reviewed the CONTRIBUTING.md guide (required)
• [ ] Documentation added
• [x] Tests updated
• [x] Title matches the required conventional commits format, see here
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